Scientific classification should satisfy three requ ir ements: no omission, no intersections and being flexible to be operated.

科学分类应当满足无漏、无交叉、易操作三个条件。

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There's no change to collective bargaining at the USPS, a major omission considering that personnel accounts for 80 percent of the agency's costs.

美国邮政的集体谈判没有改变，考虑到人力成本占机构成本的80%，这是个重大遗漏问题。

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The iPad's most glaring omission is one critics have harped on since launch -- the lack of any digital camera, which means for users, no video chat or still photos.

iPad最突出的缺点就是没有数字摄像头，这意味着用户无法视频聊天或是拍摄照片，关于这一点，自iPad上市以来就批评声不断。

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This is no innocent omission.

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Strauss, meanwhile, had no complaints with his omission from England's provisional 30-man squad for the ICC World Twenty20 tournament and insisted it was a mutual decision.

BBC: Strauss seeks new coach decision

Obama campaign spokesman Ben LaBolt said there is no particular reason behind the omission.

WSJ: Punctuation Nerds Stopped